—The final round of the competition is coming near. Can I really do well this time?—Believe in ______. You're always the best in our school.
西周时“一人跖(踏)耒而耕,不过十亩”; 战国时“一夫挟五口,治田百亩”。引起这一变化的根本原因是
生物的多样性包括生物种类的多样性、____ 的多样性和____ 的多样性。
△×□=○
▲÷■=●
○-●=◇
综合算式:____